[PATCH 4.14 086/164] KVM: arm/arm64: vgic-its: Check result of allocation before use

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Zyngier <marc.zyng...@arm.com>

commit 686f294f2f1ae40705283dd413ca1e4c14f20f93 upstream.

We miss a test against NULL after allocation.

Fixes: 6d03a68f8054 ("KVM: arm64: vgic-its: Turn device_id validation into 
generic ID validation")
Reported-by: AKASHI Takahiro <takahiro.aka...@linaro.org>
Acked-by: Christoffer Dall <christoffer.d...@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
Signed-off-by: Christoffer Dall <christoffer.d...@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 virt/kvm/arm/vgic/vgic-its.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -775,6 +775,8 @@ static int vgic_its_alloc_collection(str
                return E_ITS_MAPC_COLLECTION_OOR;
 
        collection = kzalloc(sizeof(*collection), GFP_KERNEL);
+       if (!collection)
+               return -ENOMEM;
 
        collection->collection_id = coll_id;
        collection->target_addr = COLLECTION_NOT_MAPPED;